var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var expressJwt = require("express-jwt")

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var apiRouter = require('./routes/api');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

// 对Token验证的
app.use(expressJwt({
  secret: 'kuaixiang1991',
  algorithms: ['HS256']
}).unless({
  path: ['/', '/api/login']//除了这个地址，其他的URL都需要验证
}));

// error handler
app.use(function (err, req, res, next) {
  console.log(err);
  if (err.name === 'UnauthorizedError') {
    console.error(req.path + ',无效token');
    res.json({
      message: 'token过期，请重新登录',
      code: 400
    })
    return
  }
  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use("/api", apiRouter)

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
